Update filter tool to allow more flexible filtering

https://codereview.appspot.com/7227055/



git-svn-id: http://skia.googlecode.com/svn/trunk@7492 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 79 insertions, 0 deletions

diff --git a/src/core/SkFontDescriptor.cpp b/src/core/SkFontDescriptor.cpp
new file mode 100644
index 0000000000..7679d92a14
--- /dev/null
+++ b/src/core/SkFontDescriptor.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkFontDescriptor.h"
+#include "SkStream.h"
+
+enum {
+    // these must match the sfnt 'name' enums
+    kFontFamilyName = 0x01,
+    kFullName       = 0x04,
+    kPostscriptName = 0x06,
+
+    // These count backwards from 0xFF, so as not to collide with the SFNT
+    // defines for names in its 'name' table.
+    kFontFileName   = 0xFE,
+    kSentinel       = 0xFF,
+};
+
+SkFontDescriptor::SkFontDescriptor(SkTypeface::Style style) {
+    fStyle = style;
+}
+
+static void read_string(SkStream* stream, SkString* string) {
+    const uint32_t length = stream->readPackedUInt();
+    if (length > 0) {
+        string->resize(length);
+        stream->read(string->writable_str(), length);
+    }
+}
+
+static void write_string(SkWStream* stream, const SkString& string,
+                         uint32_t id) {
+    if (!string.isEmpty()) {
+        stream->writePackedUInt(id);
+        stream->writePackedUInt(string.size());
+        stream->write(string.c_str(), string.size());
+    }
+}
+
+SkFontDescriptor::SkFontDescriptor(SkStream* stream) {
+    fStyle = (SkTypeface::Style)stream->readPackedUInt();
+
+    for (;;) {
+        switch (stream->readPackedUInt()) {
+            case kFontFamilyName:
+                read_string(stream, &fFamilyName);
+                break;
+            case kFullName:
+                read_string(stream, &fFullName);
+                break;
+            case kPostscriptName:
+                read_string(stream, &fPostscriptName);
+                break;
+            case kFontFileName:
+                read_string(stream, &fFontFileName);
+                break;
+            case kSentinel:
+                return;
+            default:
+                SkDEBUGFAIL("Unknown id used by a font descriptor");
+                return;
+        }
+    }
+}
+
+void SkFontDescriptor::serialize(SkWStream* stream) {
+    stream->writePackedUInt(fStyle);
+
+    write_string(stream, fFamilyName, kFontFamilyName);
+    write_string(stream, fFullName, kFullName);
+    write_string(stream, fPostscriptName, kPostscriptName);
+    write_string(stream, fFontFileName, kFontFileName);
+
+    stream->writePackedUInt(kSentinel);
+}